pitch at A4 vs time

[Don]

Hi all,

A pet project of mine! Pitch drop? or not?

The piano a 40" Aeolian product freshly tuned 24 degrees C. 22% humidity. 

The results:

A4 measured at A4 using Reyburn Cyber Tuner (CE) listener ear with
smoothing set off. Each reading taken 5 times using a mezzo piano to mezzo
forte blow.

A4 tuned at A4 by setting RCT to D3 (i.e. third partial of D3)

A. measurement middle wire only

time 	0	1	2	3	6 seconds before measured
play1	1.36	1.06	.81	.78	.76
p2	1.56	1.06	.89	.79	.50
p3	1.63	1.22	.77	.77	.30
p4	1.52	.98	.86	.82	.74
p5	1.45	1.04	.79	.90	.88

ava =	1.50	1.07	.82	.80	.64

B. measurement all three strings

time	0	1	2	3	6 seconds before measured
p1	.25	.27	.06	.37	.61
p2	.28	.28	.03	.50	.77
p3	.18	.28	.02	.34	.73
p4	.18	.21	.01	.39	.65
p5	.15	.24	.03	.30	.70

avb =	.21	.26	.03	.38	.70

C. differences ava - avb = d

ava	1.50	1.07	.82	.80	.64
avb	.21	.26	.03	.38	.70

d =	1.29	.81	.79	.42	(.06)

The difference in beats per second? Assuming 1/4 beat per second at A4
fundimental 

b=	.32	.20	.20	.11	.02
	

Some tentative conclussions from this preliminary data:

1. listening to the *after ring* is more beneficial to the tuner.
2. after 3 seconds there is *very* little difference in pitch
3. after 6 seconds there is virtually no difference.
4. interesting to see how pitch rose as time increased when 3 strings were
interacting from second 2 to second 3.

I did take time to check some other partials of A4 but time and the hour
ran out. The indication seemed to be the higher the partial the *less*
pitch difference between a single string and the *whole* sound. I will try
to find time to persue this next! Tenative conclussion listen to the
highest possible partial.

I hope someone out there will take the time to verify my results!




Regards, Don